general: add 'wait_10s_for_flappy_carrier' test
Check that NM waits more than 8 seconds when carrier is flapped during mtu change for example.
https://bugzilla.redhat.com/show_bug.cgi?id=1487702
@Build:nm-1-10
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Check that NM waits more than 8 seconds when carrier is flapped during mtu change for example.
https://bugzilla.redhat.com/show_bug.cgi?id=1487702
@Build:nm-1-10